Improvement in ore-crushers



UNITED STATES' CHARLES W. STAFFORD, OF SAYBROOK, CONNECTICUT.

IMPROVEMENT IN ORE-CRUSHERS.

Specification formingpart of Letters Patent No. 59,676, dated November 13, 1866.

.To all whom 'it may concern.

Be it known that I, CHARLES W. STAFFORD, of Saybrook, in the county of Middlesex and State of Connecticut, 4have invented certain new and useful Improvements in Machines for Crushing and Pulverizin g Ores 5 and I do hereby declare the following' to be a full, clear, and exact descript'on thereof, to enable any one skilled in the art to which my invention appertains to make and use the same, reference being had to the annexed drawings, making part of this specification, in which- Figure l is a plan or top view of my ma chine. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical section in the plane indicated by the line I I, Fig. l; and Fig. 4 shows parts in detail. l

In all the figures like parts are indicated by the same letters of reference.

The principal object of my invention is to .avoid the danger of clogging, which results from the excessive motion imparted to the upper in comparison with the lower part of the reciprocatin g jaw in quartz-cru shin g machines. For this purpose I avoid the use of a fixed pivot or fulcrum for the moving jaw, but mount it upon guides, and impart to it a reciprocating rectilinear motion by means of eccentrics, as hereinafter explained.

AA are the standards or supporting-plates, in which are the bearin gs ot' the working parts. On one of the plates A are brackets supporting two oscillating steam-engines, set so as to have their piston-rodsin direct connection with a crank on the end of the shaft B, and workin g at right angles with each other in a manner common to oscillating engines when coupled in pairs to the same crank-pin. A iy-wheel on the other end ofthe shaft B gives uniformity of motion.

Firmly secured on each end of the shaft B, so as to revolve with it, and between the plates A A, is a cam, C C, (shown in dotted lines in Fig. 3 and in full lines in Fig. 4,) which may be an eccentric or of any other form that may be deemed expedient. A lever made of a plate, D, and deep stiffening ribs or flanges D', (see Figs. l and 3,) carries at its lower end two friction-rollers, E, one of which is in contact with cach of the cams C C, and kept against its surface by the weight of the lever D D. The lever D D has its fulcrum on the shaft F, which has its bearings in the plates A A, and terminates in an eccentric cam, G, vibrating on the shaft F, (see Fig. 3,) and working in a concave on the back of the sliding jaw H, which moves in a rectilinear path along the guide-plates a ctx, and is kept in contact with the jaw by the collars b b at its ends, Figs. l, 2, 3. The jaw H is immovable, except for adj ustment along its guide-plate a by the keys c c between it and the key-seats c o', and extends, as well as the jaw H, across the whole space between the standard-plates, to which it is also secured by bolts \\'orki11g in slots for adjustment, as seen at d d, Figs. 2 and 3. Both jaws I-I and H are faced with steel on their contiguous sides, and these form an angle with each other, as represented in Fi 3, being farther apart at the top than at the bottom, the degree of divergence depending on the nature ofthe ore to be broken.

The shaft B has securely keyed upon it the sleeve-rings K K K K, which are corrugated on their surfaces in such a manner as to form teeth with rounded corners, and are so placed that their corrugations form continuous lines th rough out the combined length of their facesthat is, from the inside of one standard plate A to the other. The teeth thus formed by the corrugation of the surfaces of the sleeve-rings K mesh into similar corrugations on the sleeverin gsL L L, which are greaterin diameter than the rings K, and are keyed on the shaft M in such a manner that the rings K shall break joints with the rings L. (See Fig. 4L.) Motion is given by the sleeve-rings K, which thus form a toothed wheel, to the toothed wheel consti tuted by the rings L, and thence to the shaft M, which has at each end, on the outside of the plates A A, a crank, N, Figs. l and 2.

The shaft O, Figs. 1, 2, and 3, has its bearings in the standard-plates A A, and supports on its ends the fulcrums of the bell-crank le vers P P P P. The arms P P of these levers have each aslot, in which the pins of the cranks N rotate on each end of the shaft M. The other arms, P P', Fig. 2, of the bell-cranks carry adjustable bearings for the gudgeons of the pulveriZing-roller R, the axle of which passes through openings in the standard-plates A A, the length of the roller being the same as the width between the plates. This roller is in contact with a circular concave, e, having for its center the aXis ot the shaft O, fixed solidly, and terminating at its upper end in an inclined plane, which eXtends up nearly to the under .side of the wheel K, so as to bejust cleared as the wheel revolves. The roller R is kept in contact with the concave e by the key f, driven between the bearing of its gudgcon and the socket that receives the bearingblock in the arm P.

The bearings of the shaft M are adjustable laterally, as will be seen in Fig. 2, where the block g, which is the bearing, slides on the guides g' g', and is retained in position by the screw h. The bearings ofthe shaft B are adjusted laterally by a key similar to that used in the arm P of the bell-crank, either driven or moved by a screw.

The jaws being opened to their widest ex tent, and the friction-rollers E Erestin g against the ends of the shortest radii of the cams C, lumps ot' ore are placed in the hopper formed by the inclination of the faces of the jaws H H', and the engines are started. As the shaft B revolves the cam C t'orces out the lower end of the lever D D', causing the eccentric Gr to turn in its bearing on the back of the jaw H, making it slide on the guide-plate a with such Y force as to break the lumps between it and H'.

As the cam U revolves farther and lets the end of the lever D D down again, drawing back the jaw H, the lumps fall until they find space to suit them, whether big or little, and are again subjected to the breaking force, which operation is repeated until the lumps have become small enough to pass through the opening between the bottoms of the jaws H H' and fall upon the wheel L, the cori-ugations or rounded teeth ot' which carry them down until they are caught by the teeth of the wheel K, which gives motion to the Wheel L and shaft M, as well as grinds the ore that drops upon them from the jaws H H'. As the ore is liberated from the wheels K and L, be-

tween which it has been ground, it falls upon the inclined plane beneath them and nds its Way to the concave e. The crank-pins on the ends of the shaft M now rotate in the slots of the arms `l? of the bell-cranks, elevating and depressing them, and causing the arms P', which carry the journals of the pulverizingroller R, to vibrate, so that the roller shall roll back and forth upon the concave e, completely pulverizing the ore which has been ground by the wheels K and L, and allowing the ore to pass beneath it to be removed. The mill is replenished withfresh lumps as often as is de- J. vL 

